| Value | Category | 
                                    
                    
                        | -2 | No response due to skip scenario | 
                                    
                    
                        | -1 | No response | 
                                    
                    
                        | 1 | Electricity | 
                                    
                    
                        | 2 | Gas / lpg | 
                                    
                    
                        | 3 | Paraffin | 
                                    
                    
                        | 4 | Wood | 
                                    
                    
                        | 5 | Candles | 
                                    
                    
                        | 6 | Solar energy | 
                                    
                    
                        | 7 | Other | 
                                    
                    
                        | 8 | Dont know | 
                            
            Warning: these figures indicate the number of cases found in the data file. They cannot be interpreted as summary statistics of the population of interest.